Valve-lifter.



f :2: MILF ES H. BBOCKWAY, 01E' DETROIT, MICHIGAN.

valeva-mman.

Specication of Letters Patent.

Patented Nov. 2d, 191W..

Application led March 9,' 1917. Serial No. 153,607.

To all wlwt 'z'tmay concern.'

-Be it lmownthat L CIARLEs ,I-I. BrockwAY, a citizen of the UnitedStates, reslding at Detroit, in the county of Wayne and State ofMichigan, have invented a certaln new and useful Improvement lin Valve-Lifters, of which the following is a full, clear, and exact description,reference be- -ing had to the accompanying drawings.

This invention relates to an improved valve lifter or tappet for usewith 1ntern al combustion engines, and it has for Vits main objectthe'economical production of an extremely light device of thischaracter.

Valve tappets or lifters have heretofore been turned from a solid bar ofstock, w1th a consequential Waste of material and the production of anunnecessarlly heavy article. -It is essential that the vcam engagingface of the lifter be hardened in order to resist the wear to which itis subjected, and in these turned types of lifters the entire articlehas to undergo the hardening process with the liability of warping theparts of the tappet out of proper relation to each other, and the lossof the entire artlcle, a should the process fail.

My invention provides for the making of the body portion of the tappetor lifter. of sheet metal, drawing or otherwise shaping it into a hollowbarrel and head, and into the latter the insertion of a hardened steeldisk which may be secured in place preferably by turning the peripheryof the head over the edge of the disk. A pad or gasket of some Sultablecomparatively soft material, such as lead may be inserted between thedisk and head to cushion the action of the disk against the head, Aandin the event t@ that there is play between the parts, and to deaden thesound resulting from the action of the cam upon the tappet.

A further object comprehended by my invention is the provision of a verysimple and t5 edectual means of adjustment to compensate for anyshortening, as by wear, of the parts between the cam and valve.

The foregoing objects are attainedin the very simply constructed tappetillustrated t@ in the drawing accompanying and forming a parthereofwherein detail through the crank case of an engine showing myimprovedtappet in elevation interposed between a cam and valve rod;

oFig. 2 is a central vertical section through the tappet; Fig. 3 shows,in perspective, the

1mproved tappet or To portray the environments of my in.

.21, to facilitate the Figure 1 is a sectional parts of the tappet inseparated condition, the body portion of the tappet being in section;and Figs. 4 tability of prevailing adjustments, to my llfter.

vention I have shown a sectional detail through` a common engineconstruction wherein 1 represents a crank case having an aperture 2 inits top wall through which projects the lower end of a guide 3, in axialalinement with which is the valve stem 4 above and the cam 5 below.

As previously stated, the body portion of the tappet is formed of asingle piece of sheet metal and comprises a barrel and head 11. Theperiphery of the head is turned over in a direction away from the barrelto produce a flange l2. The larger diameter of a beveled edge disk isadapted to be inserted within 11 and to be held therein by the inwardlypressed edge of the fiange 12. Prior to assembling, the disk 15 ishardened for the purpose already explained. A pad 1.6, which may be inthe form of a disk or washer, and consisting of some comparatively sottmaterial, such as lead, may be inserted between the disk and the innersurface of the head, although the use of this pad is not deemedabsolutely necessary. It serves to dampen the noise produced by theactior` of the cam upon the disk 15, especially if the disk, or anyportion of it, should be loose.

The up er end of the barrel l10 may be inset, as siiown at 17, toreceive therewithin plates or shims through which an adjustment isaccomplished by the inclusion'of the required any wear of the parts thatwould result in a shortening of the distance between the cam and valve.The upper end of the barrel `mayfbe notched on each side tosubstantially the depth of the shim cavity, as indicated at insertion orremoval of and to enable the number of shims to be readily ascertained.

of the method of adjustment just I may employ a very common expedient inthe form of an `adjustment screw shown in Fig. 4, as threaded within thereduced and internally threaded upper end of the barrei 10. Ur l mayadopt a more recent practice and apply a cap 28 to the end of thebarrel, said cap having prongs the shims, employed Instead described,

and 5 illustrate the 'adap' number of shims to compensate for the cavityof the head f 29 stuck ont of itslcircularl wall and bent u ward to"receive between them the s ims 30.

From the foregoing description it will'- be seen that my inventionprovides for a very chea and convenlent production of a v highly e cienttappet that is extremely light, and that requires the hardening of onlythe disks 15 in order to make its wearing qualities equal to those ofits more expensive and prohibitively heavy predecessor.

Having thus described my invention, what I claim is:

1. As a new article of manufacture, a tappet comprising a barrel formedof sheet metal and having a valve operating end,

and a cam engaging element attached to its opposite end.

2. As a new article of manufacture, a tappet comprising a barrel formedof sheet metal, a cam engaging element attached thereto,- and a shockabsorbing member interposed between the element and barrel.

3. As a new article of manufacture, a tappet comprising a sheet metalbarrel having a flared end, and a cam engaging element of hardenedmaterial attached to said dared end.

its end flared outward into a plane perpendicular to the axis of thebarrel, a cam engaging disk applied to said portion and held in place bythe turned over edge of said portion.

6. As a new article of manufacture, .a tappet comprising a sheet metalbarrel having its end ilared outward into a plane perpendicular to theaxis of the barrel, a cam eni nannten gaging disk applied to saidportion and heid in place by the interlocked edges of said portion anddisk.

7. As a new article of manufacture,`a tappet comprising a sheet metalbarrel having its lower end ared outward and then anged downward toproduce a recessed head and a disk held within the recess of the head bythe downwardly flanged portion.

8. As a new article of manufacture,'a tappet comprising a sheet metalbarrel havingits lower end flared outward and then lianed :downward ltoproduce a recessed hea and a beveled edge disk having .its side ofgreater diameter retained within the recess of the head b the downwardlyianged portion thereo 9. As a new article of manufacture, a tappetcomprisin a sheet metal barrel having its lower en .dared outward andthen llaned downward to produce a recessed hea a disk held within therecess of the head by the downwardly flanged portion thereof, and ashock absorbing pad interposed between the disk and head.

10. As a new article of manufacture, a

tappet comprising a sheet metal barrel hav' ing an-- abutment inset fromone end for the support of ad]ustment shims, and a cam engagm 'elementattached to the opposite end of sai barrel.

11. As a new article o f manufacture, a tappet comprising a sheet metalbarrel having a closed inset end for the reception of adjustment shims,and a cam engagin element attached to the opposite end cfg said barrel.

In testimony whereof, I hereunto aiiix my signature in the presence oftwo witnesses.

.CHARLES H. BROCKWAY.

Witnesses:

Lotus L. Boonou'r, H. W. Rlzon.

